An Efficient Two-stage Type Electrostatic Precipitator for Aerosol Collection Operated by Compact Pulsed Power Generator

A two-stage type electrostatic precipitator operated by a pulsed power generator is developed for highly efficient aerosol collection. A compact and light weight inductive pulsed power generator driven by SiC-MOSFET with a diode rectifier is developed to generate a nano-second pulsed voltage superimposed on a DC bias voltage. The amplitude and pulse width of the pulsed voltage are 7.5 kV and 130 ns, respectively, and the maximum DC bias voltage is 4 kV. The pulsed voltage is applied to a plurality of wire-wire electrode to generate streamer discharges, and a DC voltage of -2 kV is applied to a plurality of plate-plate electrode used as collecting electrodes. A nebulizer is used to produce aerosol droplets which have diameters of sub-micrometers. The aerosol collection efficiency increases with increasing the DC bias voltage and reaches 100% with the DC bias voltage higher than 2.5 kV.